On Friday’s edition of Dateline NBC, Kathleen Zellner, the new lawyer for Making A Murderer’s Steven Avery, discussed new developments in scientific testing that could help her client prove his innocence.

“Generally, since 2007, there have been significant advances in forensic testing ... the clearest way to do this is with scientific testing,” Zellner said in the interview, according to NBC News. “Am I going to tell you exactly what it is? I am not. But it’s been a long time. There was a lot of evidence that wasn’t tested.” Zellner, who is known for overturning wrongful conviction cases, believes Avery is innocent of the 2005 murder of 25-year-old Teresa Halbach.

Zellner told ABC News she purchased the same make and model as Halbach’s Rav 4 in order to examine what wasn’t tested in the vehicle at the time of the trial that should have been. She also pointed out that seven recents tweets she made about the former prosecutor in Avery’s case, as well as allegations of planted evidence were mysteriously deleted. According to WNCY, some of the deleted tweets included:

“Body was not burned in burn pit bc heat would have burned down Avery’s garage. A lot of junk science at the junkyard.”

“Culprit had to remove his own DNA from key so TH’s removed in process. Rub key on Avery’s clothes for skin cells. Presto.”

“The 22 removed from garage did not exit TH’s head. State expert failed to testify bullet exited — that 22 driven to scene.”